// Make the div behave like a button
.#{$class-prefix}btn-group,
.#{$class-prefix}btn-group-vertical {
  position: relative;
  display: inline-flex;
  vertical-align: middle; // match .btn alignment given font-size hack above

  > .#{$class-prefix}btn {
    position: relative;
    flex: 1 1 auto;
  }

  // Bring the hover, focused, and "active" buttons to the front to overlay
  // the borders properly
  > .#{$class-prefix}btn-check:checked + .#{$class-prefix}btn,
  > .#{$class-prefix}btn-check:focus + .#{$class-prefix}btn,
  > .#{$class-prefix}btn:hover,
  > .#{$class-prefix}btn:focus,
  > .#{$class-prefix}btn:active,
  > .#{$class-prefix}btn.#{$class-prefix}active {
    z-index: 1;
  }
}

// Optional: Group multiple button groups together for a toolbar
.#{$class-prefix}btn-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;

  .#{$class-prefix}input-group {
    width: auto;
  }
}

.#{$class-prefix}btn-group {
  @include border-radius($btn-border-radius);

  // Prevent double borders when buttons are next to each other
  > :not(.#{$class-prefix}btn-check:first-child) + .#{$class-prefix}btn,
  > .#{$class-prefix}btn-group:not(:first-child) {
    margin-left: calc(#{$btn-border-width} * -1); // stylelint-disable-line function-disallowed-list
  }

  // Reset rounded corners
  > .#{$class-prefix}btn:not(:last-child):not(.#{$class-prefix}dropdown-toggle),
  > .#{$class-prefix}btn.#{$class-prefix}dropdown-toggle-split:first-child,
  > .#{$class-prefix}btn-group:not(:last-child) > .#{$class-prefix}btn {
    @include border-end-radius(0);
  }

  // The left radius should be 0 if the button is:
  // - the "third or more" child
  // - the second child and the previous element isn't `.btn-check` (making it the first child visually)
  // - part of a btn-group which isn't the first child
  > .#{$class-prefix}btn:nth-child(n + 3),
  > :not(.#{$class-prefix}btn-check) + .#{$class-prefix}btn,
  > .#{$class-prefix}btn-group:not(:first-child) > .#{$class-prefix}btn {
    @include border-start-radius(0);
  }
}

// Sizing
//
// Remix the default button sizing classes into new ones for easier manipulation.

.#{$class-prefix}btn-group-sm > .#{$class-prefix}btn { @extend .#{$class-prefix}btn-sm; }
.#{$class-prefix}btn-group-lg > .#{$class-prefix}btn { @extend .#{$class-prefix}btn-lg; }


//
// Split button dropdowns
//

.#{$class-prefix}dropdown-toggle-split {
  padding-right: $btn-padding-x * .75;
  padding-left: $btn-padding-x * .75;

  &::after,
  .#{$class-prefix}dropup &::after,
  .#{$class-prefix}dropend &::after {
    margin-left: 0;
  }

  .#{$class-prefix}dropstart &::before {
    margin-right: 0;
  }
}

.#{$class-prefix}btn-sm + .#{$class-prefix}dropdown-toggle-split {
  padding-right: $btn-padding-x-sm * .75;
  padding-left: $btn-padding-x-sm * .75;
}

.#{$class-prefix}btn-lg + .#{$class-prefix}dropdown-toggle-split {
  padding-right: $btn-padding-x-lg * .75;
  padding-left: $btn-padding-x-lg * .75;
}


// The clickable button for toggling the menu
// Set the same inset shadow as the :active state
.#{$class-prefix}btn-group.#{$class-prefix}show .#{$class-prefix}dropdown-toggle {
  @include box-shadow($btn-active-box-shadow);

  // Show no shadow for `.btn-link` since it has no other button styles.
  &.#{$class-prefix}btn-link {
    @include box-shadow(none);
  }
}


//
// Vertical button groups
//

.#{$class-prefix}btn-group-vertical {
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;

  > .#{$class-prefix}btn,
  > .#{$class-prefix}btn-group {
    width: 100%;
  }

  > .#{$class-prefix}btn:not(:first-child),
  > .#{$class-prefix}btn-group:not(:first-child) {
    margin-top: calc(#{$btn-border-width} * -1); // stylelint-disable-line function-disallowed-list
  }

  // Reset rounded corners
  > .#{$class-prefix}btn:not(:last-child):not(.#{$class-prefix}dropdown-toggle),
  > .#{$class-prefix}btn-group:not(:last-child) > .#{$class-prefix}btn {
    @include border-bottom-radius(0);
  }

  // The top radius should be 0 if the button is:
  // - the "third or more" child
  // - the second child and the previous element isn't `.btn-check` (making it the first child visually)
  // - part of a btn-group which isn't the first child
  > .#{$class-prefix}btn:nth-child(n + 3),
  > :not(.#{$class-prefix}btn-check) + .#{$class-prefix}btn,
  > .#{$class-prefix}btn-group:not(:first-child) > .#{$class-prefix}btn {
    @include border-top-radius(0);
  }
}
